Power Systems Questions and Answers – Cost Analysis of Power Plants

This set of Power Systems Multiple Choice Questions & Answers (MCQs) focuses on “Cost Analysis of Power Plants”.

1. Which of the following costs come under semi fixed cost?
a) Salaries of high officials
b) Salaries of operational and maintenance staff
c) Salaries of Management and clerical staff
d) Annual cost of fuel
View Answer

Answer: c
Explanation: The semi fixed cost is due to annual interest, the capital cost of generating plant transmission and distribution network building and other civil works, all types of taxes and insurance charges and salaries of Management and clerical staff. Salaries of higher officer is a fixed cost and salaries of operation and maintenance staff is running or operating cost.

2. Which power plant has minimum operating cost?
a) Hydroelectric power plant
b) Thermal power plant
c) Nuclear power plant
d) Gas Turbine Power Plant
View Answer

Answer: a
Explanation: Hydroelectric power plant has lowest running cost because it does not needs any fuel and can be operated by few number of persons. Nuclear gas and thermal power plant requires fuels also the handling cost of fuels is added with the total cost.

3. Which of the following is most likely to nuclear power plant?
a) Thermal power plant
b) Hydroelectric power plant
c) Gas turbine power plant
d) Nuclear power plant
View Answer

Answer: d
Explanation: Most of the parts of nuclear power plants are similar to the thermal power plant, except the heat generating system. In thermal power plant heat energy is produced by the combustion of fossil fuels like coal, Oil or gas. In nuclear power plant the heat energy is produced by Nuclear Fission of nuclear fuels like Uranium or plutonium in reactor.
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4. Which of the following have highest operating cost?
a) Hydroelectric power plant
b) Thermal power plant
c) Nuclear power plant
d) Solar electric power plant
View Answer

Answer: b
Explanation: Operating cost of hydroelectric and Solar Power Plant are very low because they don’t need fuel. In nuclear power plant fuel required is of very small quantity as compared to coal required by thermal power plant. Due to above the cost of transportation of fuel and also the cost of fuel itself is low for nuclear power plant.

5. Which of the following least affect the cost of electricity produced in thermal power plant?
a) Cost of fuel
b) Cost of transportation
c) The load factor
d) Salaries of higher officials
View Answer

Answer: d
Explanation: Change in fuel cost by 20% main cause about 8% variation in total cost per KWh generated. Cost of transportation and the load factor changes and also cause variation in fuel cost. The salaries of higher officials comes under fixed cost and so it does not affects the cost of fuel.
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6. Which of the following power plant have longest physical life?
a) Thermal power plant
b) Nuclear power plant
c) Hydroelectric power plant
d) Diesel power plant
View Answer

Answer: c
Explanation: Thermal and diesel power plants are so constructed that their efficiency Falls over time faster as compared to hydroelectric power plant. Nuclear power plant also needs maintenance over time. The components of hydroelectric power plant including turbine, generator and the concrete Dam are so rugged in construction that their life maybe as long as 80 years or even longer.

7. When load factor and diversity factor increases ___________
a) cost of electricity decreases
b) cost of electricity also increases
c) cost of electricity remains same
d) cost of electricity increases exponential
View Answer

Answer: a
Explanation: Load factor and diversity factor playes an important role in cost of supply of electrical energy. Higher the value of load factor and diversity factor, lower will be the cost per unit generated.
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8. Which of the following has highest diversity factor?
a) Domestic lightning
b) Commercial lightning
c) Industrial power
d) Domestic power
View Answer

Answer: a
Explanation: Diversity fector of all of the options rangers from 1.5 to 2. The diversity factor of domestic lightning upto 1 kilo watt rangers from 3 to 5.

Sanfoundry Global Education & Learning Series – Power Systems.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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